Diff: ADC_setup.cpp

Revision:

0:d322a5241da8

diff -r 000000000000 -r d322a5241da8 ADC_setup.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/ADC_setup.cpp	Wed Dec 16 12:04:23 2009 +0000
@@ -0,0 +1,48 @@
+// ADC_setup.cpp
+
+#include "header.h"
+/*****************************************************
+ variables and defines
+ ****************************************************/
+
+int ADC_channel=1;     // ADC channel 1
+
+/*****************************************************
+  subroutines
+*****************************************************/
+void ADC_init(){
+
+     PINSEL1=0x00010000;  //set AD0.1 pin to 0000 0000 0000 0001 0000 0000 0000 0000 = ADC
+     PCONP |= (1 << 12);  // enable ADC clock 
+     AD0CR = (1 << ADC_channel)     // channel 1 
+           | (4 << 8)     // This gives us 3MHz 
+           | (0 << 16)    // BURST = 0, software control  
+           | (0 << 17)    // CLKS = 0 (11-bits)  
+           | (1 << 21)    // PDN = 1  
+           | (0 << 22)    // TEST1:0 = 00  
+           | (1 << 24)    // START = 1 start A/D conversion 
+           | (0 << 27);   // EDGE = 0 (CAP/MAT singal falling,trigger A/D conversion) 
+}
+float ADC_read() { 
+
+    int data;
+     
+    // start A/D conversion on channel 
+    AD0CR &= (AD0CR & 0xFFFFFF00);  
+    AD0CR |= (1 << ADC_channel) | (1 << 24);       
+  
+    delay_l();
+  
+    // wait for it to finish by polling the ADC DONE bit         
+    while((AD0GDR & 0x80000000) == 0) 
+    {
+    }
+      
+    // get the data and stop the adc 
+    data = AD0GDR; 
+    AD0CR &= 0xF8FFFFFF; 
+  
+    // shift data and mask to give 8-bit ADC value
+    data=(data>>8)&0x00000FF;  
+    return data; 
+ } 
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